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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2117d92760a0ac3f346a84f5fbd7ac0fc40e711804691a98e013649241a102' 
  AND token = 'OGPzbb/tmi6adfZABKsr0lxPx129h6psjBfvcZp07k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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