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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae6eb94886fdf9e7771978339ffcdf411e8a8df1ee10411eb76f5d20091e1d3a' 
  AND token = 'PvoFt8bznqB6NiZBMq7lRJyjBPhpsAKdT9lRRyCrORg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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