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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aba9845ec2803b13b8871a7355d4ea6df3b8fede1877928aa2a67faf93bad44' 
  AND token = '1HTOga2lm8iyUchePQ+FjBLo+wiogV+WQTKMpIgreOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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