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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66cecfdf0641da5232888a13eb9149dbc72ffe85bc407390daae43985e942225' 
  AND token = '2llEuSBubz0fSn+dF71aPXkmUFYWJyiPUFSvM1+kDr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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