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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48ee4af5970dc9bff6460c1767ff613150c2d47f6f1216de3bcd8baaa6fa4ce1' 
  AND token = 'OLgZrmbCrSRSuV1pQmmhigfSXxrEWeWHlJKBwgvxbzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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