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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5238a6da6d4b8c18f8ebca8b9ca2b5747ffa146e638e0467baf5f8847094824f' 
  AND token = 'Aglj70kZeCk2q3TmCUE3AWBcgDG1Ibg9jHZV4wnIVeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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