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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bafed2fb126b4fe80e69b2be957bf5ec81797e2cb27fac160f5aff0e22985be' 
  AND token = 'FAyP1a6Um31WZEMw8IEbS/souL+sWchZ3Muc7/nazGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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