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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa58b935de2f1768c2357cfb10e667c866610a6c02536c792bfdf91ea755d487' 
  AND token = 'yxrRFwPoCEomSWAopQw5MklqQJOoRw5XbvAjmCBhd/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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