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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdaccd52bc796def85842a2eb5d6a5500fd21c41c22327dbca34d70df9d82059' 
  AND token = '7gXZ1Rv87tGYGoDcRwQQGzy+ajUv/8j+1aB2vjyiqkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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