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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8767c6775c2b458dd120a3ff206f140366c5c43b599ce726e5c3782a758062c' 
  AND token = 'OCz971aY2yFXW2O6kStwiNVQ7L+qOufslt80a+wHvho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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