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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92baffe37a530df276bbc2b8d5dd4253ba92775a6304a668b6223923af5e6ca' 
  AND token = 'RtjD63kTA6s8W36AlTaUpfVCxbio2cmJUAK+mTsG5FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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