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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74a9ef88aa6f4e67977321c56241db9acb681edb1c2a68a7e50d0648f957598b' 
  AND token = 'eK62QFubufEZZ/HFH9jNKPw8ppor7SnDUakURNDauQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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