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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1faf2f2503c99b7137533ee57a3febfd255f1d4b547a0e86e50e2aecbf0d38c6' 
  AND token = 'UEbUtjAVLpntuluEk8MZScXUGN4QDnM0fWOLQbElJK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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