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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c50949eef6aed39174799a1c1f3b319695b6d25fbdecb4938b971dd074bcd13' 
  AND token = 'G2VSxn4tFAnk4cvaTUYtbrMG838FZLMHzX30/8k0f6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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