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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a72832b93a6cd1cb3a511749dec58076a139c83d493a30fc2453d77c1f592d2' 
  AND token = '5mzXFlna/TVOZblREZ99ss0+mPh175DnIpA9x2LnWfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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