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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a048dfb38419cdee8f06ac820eb06738cc11803084b0fd7d1a7efea379789c5' 
  AND token = '7aM3U/sYdTQZpT5GKd7DE24rxHFBiuNr4xlR6i+ea6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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