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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb1bcd1275efdf8695f01b43bd719acdd712f0f0456a88dc1f26687e713e07a' 
  AND token = 'QACXth1E7S1flB85ijPlOVQzoWWNU8xH/WAPL2CiHaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}