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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3639929143192f3a469dec4e6786497573f957ce95757d01590b4be3f6acd1d' 
  AND token = 'kkuHO4xuMu1EDtNMSLpgovJeCjo8ewn2PelkQenWmyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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