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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0355b0060696ae48c66d2d6e8c5264190bb4928609010eba62e05aa246a22b9' 
  AND token = 'PnycA3mDXVjPUOGEqMqvH6RkzEubMXm+y1kumQuziBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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