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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a9e406fa3999d7c610463ca28619dc4ce9531df5f6dc463cb93fa1826004fab' 
  AND token = 'DOt1P8Jxj6cZgWoJZOolmujXUsB2AnZovVI44w4emXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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