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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5f33e4e82d62b57d4e3a2352bec750916d298fc0edfff7704362b01919c6001' 
  AND token = '8QDcsWe6YWetNcs8vxBEx5HARHtIPfvYxfZV0eq7tcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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