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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2af4d2b653d1ffb49267d653a4f8e52997fb61fa2cd974e6e7652962dbc7e7' 
  AND token = 'cGi1dooidHEmd6NivzYyREkrLM54ll6zJ+Gs+ASOfJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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