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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002a08832d7e5779e3222b350f1ff25b50c5e6d485e7c6b3dfb8eec35c46efbf' 
  AND token = 'u43PvHWlKZ84Eme0ogki36rP3AEghcNhdrhiISdCrxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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