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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc27df020a47c6db24a8b7f5e125f2d478f26fb85697a13e6257465f3774a07a' 
  AND token = '8nXtrJ3K9/wYVMQ0M3MDA6fwXszGX4Brg9BVcAdnit0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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