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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d6004973eaf47807ce63bf82dbbeb7f417de29f39c150439c9a97212572499' 
  AND token = 'sBCFBtC6VkpPFbc3/Jmex8efc3g4wl3ShQ254bqODA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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