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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a0a3c5d17a15d6ebfab6880ce056f85e2338d5d67cc86565ccc4fa0f7e83c6e' 
  AND token = 'tlwGtm+CKLP5qaG7oLPzRwj5aKg6BNCq3UP3TAtk8mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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