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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b816bfa058e006feadfcbf7c0226c99793fc791996ad38699e312b573bf886a1' 
  AND token = 'sZ6xDA/SEXn5JVCV/UQw8610hINFp6m75kypgcveaGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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