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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd6f75e819730183863ffa2f84701f26b0d2cba36c3a9fc5156ba156d337c6e4' 
  AND token = 'pCxVANicj6zBRyy/mS0sAI1dPmLMwvi3qpoPVtTkn2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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