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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b69d27541593fe19c498f94c116901c11afb9691d06a66a5ad82fcade5effa' 
  AND token = '+S0IHsekikvew15PF1crEx6DnS1Wfe0Cjr+i9yoCsKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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