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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2774f2ec9b187d05a85fd43576317709127150c82e0e5fcb29cfdfa66c298aa8' 
  AND token = 'jmkZHQZ0JBXUXify2eikSxnX4Y4k5JpwtrwLV4G43wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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