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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f8d2c596cd36c78804f83361beb3ebc1965ac4df6f517a0aba22112aba2071' 
  AND token = 'IRtoh1bAWBsjGUpEvd9ZcixxXWMYY8KY/K9/AUb9E1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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