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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08c0f4f93f0c86ebab3d6b54a930d3b259885ab74e5913735e01d95101630bb' 
  AND token = 'CZphOQAT5iVRsnDZLk3a1MEUuonng4fS9ZpQuOjybiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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