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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40cc97ea3a355b53eb7e37cc47fbd8fe9186d12e4b0744729c204cc14d538b4a' 
  AND token = 't7kmwZautjcaPLIO7KH7j0LReH1vCCpbK05AYxhGpEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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