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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d3bd89e5081bb88dcdd5c0b0f72536ab9eca86cb2af8d484392fb80b9e3b74' 
  AND token = 'H9TzDqg4KHgqbmSLkNgkTeAy4gu5EdJOuUd4z/aoGBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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