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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371c19ceb07ca6ba2c29cb021d49506fad2dd1dee8b0e880d84023702398ba80' 
  AND token = 'h/JCjP+bDtpKNCU3Ybr+irnuyxD4ahCFknaR//0rX88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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