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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '759518617daf64a8409537a2b443e9d5bc576e6d5ac0844bb9e4482d5a039c3d' 
  AND token = 'zaHjMTUJI71PMffYn0/mkQGiZED0Yx24D4DfHwNiBmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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