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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7196c99e19263686efc6aab1f577132f8d8c69bd286e2de9251eea079c2d6e6f' 
  AND token = '4OwLvNzb3zAP4wCyZfhxy4UcpuaTytsOABOaIcBErvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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