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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac3f6a6beb7ecefbb354556a49692c59c4e8420b39a3e83f33866ffddecf5b58' 
  AND token = '0mrEmxFA1kl+jq59hobwiCg8WFxbbpQTjIPVrz4C9B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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