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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d3197881c39c22f448bae1a829988c358b41486b847e00ec46c118f0d79f49d' 
  AND token = 'fYfzPEcb9vHsi7BaIp6+vHWIy71Ji8FehJTwNqCnT70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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