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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ab18b31f999c4262885fa3324a650fd1165454bb2871a56efe24cccae2616f' 
  AND token = 'H3eV6Ma7cSCcL/vTIdyO4LZBD7/JGq3NI4GCgL3uXV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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