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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a9dabedf3485e91aeb0f0caff2ae62b8ec85d5566edca224c2e287ecacc6db' 
  AND token = '7Dy73ijonFlWAPq+VEQV/AwpGiR8+mgM+BGICA0iUfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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