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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6084912e852a20377adbb8db4c3415024818bf975fab2e51867febf6285d4269' 
  AND token = '4EQ7rW04SpkMO7mYv2KID68wxFXsA9MhEGOuhv6xxEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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