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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ac02fbb33faaa509385f80a1896fa09dd4d7b518cb14ba11cefbbe8c1f1552' 
  AND token = '6XLdxsZ9nddFTW26wftKmzSfll23CVlODy9RG2bZEB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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