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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51547d5eb1a9d07cf3d899a076e761bd9d1b73d7edcf0af9050cefc9087bdd3f' 
  AND token = 'Q3p+LphGo71e47WwFz5do5Ic8X7WTcsXYejpK84FPWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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