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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97646c19ce89b417960b44bf9be2e86abc397753508cca377d5e2a6818909220' 
  AND token = 'ByuR3gq4n2ShSWrtAmSNaB2yDQGF9uHATl9C75K3+TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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