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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dfd6ec4c75223d3b35084833a8ecd63379c95dbddf3b2766441f00d85df68d8' 
  AND token = 'LVxrgSLgzT2zr4CdlKf7sb2fmkCI7Dli04dnsclZ2YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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