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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '095e1cf5cc6ef4c1c8cdaa3e3d4770a7048b471ee84b8413838dcd12b0a00a7c' 
  AND token = 'vNgNCM6MTweNzmXHFADfxkBNxTq1zy4ron5vHSV41Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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