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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2093a205f4da7b48355aca4953a1c2fa61087facafd797af7671a8614df5e1' 
  AND token = 'QRbFrqcRxayQGg47D0ByJ/F7pE+UJsPvatp5gr5TEd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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