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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84e50a8a63bde4dba276db500fe3400d26d8dc7482c685a1c3c62ccec74c065' 
  AND token = '8xQI+Ms8JKCj9dSQpouMUxs+iQ/A35ROy1rsyY2r1ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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