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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e03d2e551b1ab2fc8bed0336efc0dd2161ec29f5a6b018dd235a1d6b675dd2c6' 
  AND token = 'RRCP1F+d3l+7rnw0x3ibjBfqY+c2BeS2aH+MJtryOA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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