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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15f4983d0f0560727f619576a5c4ab9bd5416f40873adf73f77d07e009b8a7cc' 
  AND token = 'i2lY0K4KTdmayu14gNVp2UsTF1StlJm00DafrAFCD+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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