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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2024293b8ff2abcb2441feb10a783ef383b5d51f5b2f5b8f6bf46aea81dddff' 
  AND token = 'jaG8/Kj7xRUikPCorRGzQoE5g9XP3SkDIqwcx8QIVpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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