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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b129fa15decfc990062c05f33e488899d124caf4e577bc2bfbeb4cab03b1bbaa' 
  AND token = 'jtRjyzvMvcgxmAv6N33JRO6CC8SE5pJxhz7xP4Zws2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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