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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '425d1c0a4589a01b4519a89a9f94ced53ab3bc141202e59a04093782dea99ff4' 
  AND token = 'OWCGDDSgquAAtz6FjK2M0sexYOdY7jdF/ojx3d2RSCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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