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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8395d3c0a345849c45ef23486f716ce509c93eb25a9f2807170a4884bccbb3b2' 
  AND token = 'Bda+CKEygI+KC5by6uA9WMqy46NjadbnYZI1E1+jxMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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