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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '478066b109dcf1bdb7db12fc8d4d6e8c21dc7bff15ef19b4ef0b54484c4c1f7e' 
  AND token = 'gti/rWTUOogTPbFF0gjpQP2XC9G84HVWBa9z6j1fOrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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