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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2272ca4296dd9e77a2bf6b920b7a4f40b9415314b27156616c62ce62f6ecdac' 
  AND token = 'DBT4ND4+pNM2lXiqcgk9Ar156d86xEuqtxFuctxFNac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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