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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475788ef393a7ad34a18e5f4a0d4653df5ee412147d3db6f947ebf1c107c58cd' 
  AND token = '9FjmlKOIWJ6bRDkDXkKNKh6fte0Qf/u6K88Fe8nVMhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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